First of all, Cerakote is never applied over a bead blasted surface so that might have confused a few people. I cannot presume to know what Stag's process is for applying Cerakote since they can leave the parts to be Cerakoted non anodized or they could anodize everything. Only Stag can accurately answer that.
Anything other than the hardest type III anodizing will come off in the sandblast cabinet. It is recommended by the manufacturer of Cerakote ( NIC Industries ) to still sandblast over hard anodizing but at a reduced air pressure similar to preparing plastic surfaces for Cerakote. You can Cerakote water if you like, but you will not achieve optimal results, so some might not follow munufactures directions and think the product is just fine because it looks good, but it is not the best end result possible.